Thread-tensioning device for circular loom shuttles



W. A. DICKIE ET AL.

THREAD TENSIONING DEVICE FOR CIRCULAR. LOOM SHUTTLES Filed Nov. 27, 1956 WILLIAM A mam RANK 0 HALE ATTORNEY;

Patented Oct. 11, 1938 v PATENT OFFICE THBEAD-TENSIONING DEVICE FOR CIRCU- LAB LOOM SHUTTLES William Alexander Dickie and Frank Spondon, Derby, Celanese of Delaware Application November 2'7,

In Great Britain January 17, 1

This invention relates to thread-tensioning devices for circular loom shuttles and in particular for the weft spools of circular loom shuttles of the type shown in. U. S. Patent No. 2,050,328 in which the weft is wound between two flanges of considerable diameter in relation to the axial depth of the spool. 7

According to the invention, the spool is held stationary and the weft is led over one flange of the spool by means of an annular guide co-axial with the spool and disposed so as to prevent contact of the weft with the spool flange. The weft is led substantially to the centre of the annular guide and then delivered to the fell of the cloth, 'the tension in the weft thus being largely determined by its deflection over the edge of the annular guide and at the centre of the guide.

The guide may be in the form of a light wire spider with its rim lying in the plane of the spool flange or even somewhat inside this plane; or, in order to make sure that contact with either the inside or the outside edge of the flange is avoided, the width of the annulus may be increased, as, for example, by forming it of two wires side by side. The guide may be arranged to rotate so as to provide for low weft tension, this rotation being provided either by pivoting the guide about the centre of the spool or on an independent support. The weft may be caused to engage the annular guide positively so. as to rotate the guide and add to the wefttension. This positive engagement may, however; be such as to permit the guide to overrrun the weft, e. g. when weaving stops, as by the provision on the edge of the guide of a number of small hooks with which the thread engages as it rotates about the spool during unwinding, over-running of the guide releasing the weft from the hook with which it has become engaged. For this purpose the hooks are preferably arranged so that during such overrunning the weft may pass freely over the hooks. In order to prevent weft that has become loose on the spool when weaving stops from leaving the spool and becoming snarled in the shuttle or mechanism connected therewith, as for example when crepe or other twisted yarn is used, a box or casing may be disposed so as to surround the F spool closely.

By way of example some forms of apparatus according to the invention will now be described in greater detail with reference to the accompanying drawingin which Fig. 1 is a side elevation of a s u e embo y- Corporation of America,

larger scale than by means of clips 6| a stationary guides 9, l0 disposed 'of the fabric.

front to the rear Gorbyn Hale, asslgnors o a corporation England,

1936, Serial No. 112,964

3' Claims. (01. 139-13 ing one form of apparatus according to the invention in association with the weft spool;

Fig. 2-is a cross-sectional elevation of part of the apparatus shown in Fig. 1; Fig. 3 is a plan of a detail of Fig 1; Fig. 4 is a side elevation of a spool of the type shown in Fig. l and equipped withanother. form of apparatus according to the invention; and

Fig. 5 is a cross-sectional elevation of part of the apparatus shown in Fig. 4 viewed on line 5-5 of Fig. 4. Figs 2, 3. and 5 are drawn on 4. I

Figs. 1 and 2 the shuttle 6 carries weft spool I from which weft thread 8 proceeds through on the shuttle to thefell II I Referring to The spool I is bored centrally to receive a bushing l2 (Fig. 2) able. hollow spindle l3 of a weft unwinding and tensioning device. The device comprises a light wire spider consisting of arms l4 and a rim l5, the arms being radially supported by an outstanding flange Hi the hollow spindle l3 and being bent. inwardly so as to hold the rim l5 substantially in the plane of the front flange of the spool 1.

At the commencement of weaving the weft thread 8 isled over the rim l5 of the spider and threaded through the hollow spindle 13 from the of the spool, from whence the thread passes to the guides 9, l0 and to the fell H of the fabric. The weaving. tension in the thread causes it to bear against the rim IS in the spool with the result that the spider rotates and guides the thread clear of the front flange of the spool. The direction of rotation of the spider l4, I5 is indicated by an arrow in Fig. 1.

thread 8 engagespositively the rim is standing hooks l8 at intervals round its periphery (see Figs. 1 and 3), any hook engaging the thread while allowing of free passage of the thread across the rim I5. The shanks of the hooks 18 are shaped in such a manner as to ofier no resistance to disengagement of the thread 8 the event of over-running of the the rim [5 spider bases of the IS in order that the hooks may pass the thread freely without catching the thread during any such over-running of the spider. Inthis manner though the spider assists in unwinding the thread .8 during weaving any over-running of the spider formed with outwhich forms a bearing for a rotato formed at the outer end of 25 round the rims 32, the-disposition of which en- .ingfrom'the spool from contacting with a flange,

2 2,132,462 7 on stoppage'of weaving does not cause the weft cessive over-running of the thread on stoppage thread 8 to continue to unwind. of weaving, a length of furry material 34 such In order to tension the thread 8 and to reduce as closely cropped sheepskin or catskin is disposed any tendency to over-running of the spider I 4, so as to contact with the rims 32 and consequently termine'ddegree.of resistance.to rotation of the fur is secured to a curvedlsupport 35 which is hollow spindle I3. 'Thus, thebore of the bushing suitably attached'to the shuttle.

I2 is of larger diameter near the flange l6 (see While in Fig. 4 the fur 34 is shown contacting spring 2!] which encircles the hollow spindle 13' "32 it will be understood that when weaving a and bears at one end against the interioro'ffthe weft of'a type "which tends to snarl or unwind bushing I2 and at the other against-"the flange 'from the spool too freely, e. g., a crpe weft, fur hollow spindle I3 is heldin position againstthe 7 3-2 of the type shown in Figs. 4 and 5 has been 15 looking spring 2! which bears against a washer unwinding spider, it will be understood that 22 and fits into a groove formed. round theendv suchiimcouldbe provided on a rotatable spider as at 24 and slightly expanded and sprung; so as doublerirns 32 of Figs. 4 and 5 could be replaced into'position'in'the bore. The resistance torotaan'd*2.

tion of thehollow'spindle I 3 (and hence-thede- Having described'ourinvention what we desire greeof tension in the thread'a') may be varied to secure by Letters Patent is:-

by changing the spring *20 for one of different 1. 'Acircular loom'shuttle'comprising a circular 25 strength. weft *spool having 'flanges of considerable depth,

In Figs; e and 5aspool25having a non rotatmeans'for holding said spootstationary in the ing weft unwindinggui'deinthe form of a light shuttle, an annular guide disposedcoaxially with trallytoreceive a hollow core 26 which is fixed ing from the spool from contactin'g'with a flange in'the bore of thespool'by a locking'spring 27 of thespool; and means co.-operating with .said and a co-opera'ting washer 28 disposed at the guide for restraining too'free passage of' the inner end of the core. The-core '26 holds a'tube thread round the guide;

.29 of porcelain or the like which guides the 2. -A circular loomshuttlecoinprising. a circular thread smoothly from the front to therear of weft" spool having flanges 'of considerable depth, 2'

arms 3| are bent inwardly'towards the spool arms coaxially'with the spool and on' opposite i0 Atthe commencement of weaving the weft operating with said guides for restraining too t thread (designated by 33 in Fig. 4) is led over free passage of the thread round the guides. the rims 32 and threaded-through thetube 29 3;.A weft spool for circular loom shuttle comfrom the front t'otherear'of" the spool 25. The prising an annular guide disposed c0axially with suresth'at thethreadis' guided clear of theinside of thespool, and'means co-operating with said andoutside surfaces of f th'eouter'fiange .ofthe guide for restraining :too free passage. of the spool. I thread roundthe guide. In order to prevent too free passage of the WILLIAM ALEXANDER DICKIE thread-3'3 round the rims 32, and to'prevent ex- FRANK CORBYN HALE 

